Low 1,25-dihydroxyvitamin D levels are associated with severe COVID-19: an observational study in hospitalized patients.

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Title: Low 1,25-dihydroxyvitamin D levels are associated with severe COVID-19: an observational study in hospitalized patients.
Authors: Canbolat Unlu E; Department of Infectious Diseases and Clinical Microbiology, Bakirkoy Dr. Sadi Konuk Training and Research Hospital, University of Health Sciences, Istanbul, Türkiye., Karabela SN; Department of Infectious Diseases and Clinical Microbiology, Bakirkoy Dr. Sadi Konuk Training and Research Hospital, University of Health Sciences, Istanbul, Türkiye., Yesilbag Z; Department of Infectious Diseases and Clinical Microbiology, Bakirkoy Dr. Sadi Konuk Training and Research Hospital, University of Health Sciences, Istanbul, Türkiye., Korkusuz R; Department of Infectious Diseases and Clinical Microbiology, Bakirkoy Dr. Sadi Konuk Training and Research Hospital, University of Health Sciences, Istanbul, Türkiye., Borcak D; Department of Infectious Diseases and Clinical Microbiology, Bakirkoy Dr. Sadi Konuk Training and Research Hospital, University of Health Sciences, Istanbul, Türkiye., Salim Dogdas E; Department of Infectious Diseases and Clinical Microbiology, Bakirkoy Dr. Sadi Konuk Training and Research Hospital, University of Health Sciences, Istanbul, Türkiye., Senoglu S; Department of Infectious Diseases and Clinical Microbiology, Bakirkoy Dr. Sadi Konuk Training and Research Hospital, University of Health Sciences, Istanbul, Türkiye., Isiksacan N; Department of Clinical Biochemistry, Bakirkoy Dr. Sadi Konuk Training and Research Hospital, University of Health Sciences, Istanbul, Türkiye., Kart Yasar K; Department of Infectious Diseases and Clinical Microbiology, Bakirkoy Dr. Sadi Konuk Training and Research Hospital, University of Health Sciences, Istanbul, Türkiye.
Source: Frontiers in nutrition [Front Nutr] 2026 Jun 05; Vol. 13, pp. 1836021. Date of Electronic Publication: 2026 Jun 05 (Print Publication: 2026).
Publication Type: Journal Article
Journal Info: Publisher: Frontiers Media S. A Country of Publication: Switzerland NLM ID: 101642264 Publication Model: eCollection Cited Medium: Print ISSN: 2296-861X (Print) Linking ISSN: 2296861X NLM ISO Abbreviation: Front Nutr Subsets: PubMed not MEDLINE
Database: MEDLINE Ultimate
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ISSN:2296-861X
DOI:10.3389/fnut.2026.1836021